DIN929-2000

ICS 21.060.20 Sechskant-Schweißmuttern DEUTSCHE NORM January 2000 929 { Continued on pages 2 to 5. © No part of this translation may be reproduced without the prior permission of DIN Deutsches Institut für Normung e.V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany, has the exclusive right of sale for German Standards (DIN-Normen). Translation by DIN-Sprachendienst. In case of doubt, the German-language original should be consulted as the authoritative text. Hexagon weld nuts Ref. No. DIN 929 : 2000-01 English price group 06 Sales No. 0106 06.00 Supersedes February 1998 edition. In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used throughout as the decimal marker. Foreword This standard has been prepared by Technical Committee Schrauben und Muttern mit Außenantrieb of the Normenausschuss Mechanische Verbindungselemente (Fasteners Standards Committee). In the December 1972 edition of this standard, nuts of property class 8 (‘weldable’) were specified. Since then, proof loads have been increased and new nut heights specified both in International and European Standards (cf. DIN EN 20898-2). It did not seem advisable to adapt the nut heights to those of nuts with full loadability, since weld nut mounting is largely automated. Changing the nut dimensions would thus have given rise to considerable difficulties (retooling), which would not have been offset by the advantage of a slightly higher resistance to stripping. Instead, this standard specifies steel with a maximum carbon content of 0,25 % and proof loads which are deemed sufficient for weld nuts to be used together with bolts of property classes lower than 8.8. Weld nuts with a higher loadability are specified in DIN 977. The DIN 4000-2-9.4 tabular layout of article characteristics shall apply to nuts covered in this standard. Amendments This standard differs from the February 1998 edition as follows: a) Table 1 has been amended to include limit deviations for dimension h2 for thread sizes M8 and M10. b) The designation of hexagon weld nuts with UNF thread has been specified. c) Some editorial amendments have been made. Previous editions DIN 929: 1965-09, 1972-12, 1983-08, 1987-09, 1998-02. All dimensions are in millimetres. 1 Scope This standard specifies requirements for sizes M3 to M16 coarse and fine pitch thread hexagon weld nuts of product grade A, for use with bolts of property classes below 8.8 as specified in DIN EN ISO 898-1. Hexagon weld nuts with flange are specified in DIN 977. 2 Normative references This standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the titles of the publications are listed below. For dated references, subsequent amendments to or revisions of any of these publications apply to this standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. Page 2 DIN 929 : 2000-01 DIN 13-1 General purpose ISO metric screw threads – Nominal sizes for 1 mm to 68 mm diameter coarse pitch threads DIN 13-5 General purpose ISO metric screw threads – Nominal sizes for 1 mm and 1,25 mm fine pitch threads with diameters from 7,5 mm to 200 mm DIN 13-6 General purpose ISO metric screw threads – Nominal sizes for 1,5 mm fine pitch threads with diameters from 12 mm to 300 mm DIN 13-15 ISO metric screw threads – Fundamental deviations and tolerances for screw threads of 1 mm diameter and larger DIN 267-2 Fasteners – Technical delivery conditions – Product grades and tolerances DIN 977 Hexagon weld nuts with flange DIN 4000-2 Tabular layouts of article characteristics for bolts, screws and fit bolts DIN EN 20898-2 Mechanical properties of fasteners – Part 2: Nuts with coarse pitch thread and specified proof load values (ISO 898-2 : 1992) DIN EN ISO 898-1 Mechanical properties of fasteners made of carbon steel and alloy steel – Part 1: Bolts, screws and studs (ISO 898-1 : 1999) DIN EN ISO 898-6 Mechanical properties of fasteners – Part 6: Nuts with fine pitch thread and specified proof load values (ISO 898-6 : 1994) DIN EN ISO 3269 Fasteners – Acceptance inspection (ISO/DIS 3269 : 1998)*) DIN EN ISO 4042 Fasteners – Electroplated coatings (ISO 4042 : 1999) DIN EN ISO 4759-1 Tolerances for fasteners – Part 1: Bolts, screws, studs and fit bolts – Product grades A, B and C (ISO/DIS 4759-1 : 1997)*) ISO 8992 : 1986 Fasteners – General requirements for bolts, screws, studs and fit bolts ANSI B1.1-1989 Unified inch screw threads (UN and UNR thread form)1) 3 Dimensions The design shown is for illustrative purposes only, but the dimensions of nuts shall be as specified. Figure 1: Nut dimensions (notation) *) Currently at draft stage. 1) Obtainable from Beuth Verlag GmbH (Auslandsnormen-Service), 10772 Berlin, Germany. Detail X Detail Y (sectional view) Page 3 DIN 929 : 2000-01 Table 1: Nut dimensions Thread size b d2 d3 d4 e1) d1 d1 × P2) Limit d11 H13 Max. Min.deviations M3 – – 0,8 4,5 4,5 3,15 8,15 M4 – – 0,8 ±0,2 6 6 4,2 9,83 M5 – – 0,8 7 7 5,25 10,95 M6 – – 0,9 ± 0,22 8 8 6,3 12,02 M8 M8 × 1 – 1 ± 0,25 10,5 10,5 8,4 15,38 M10 M10 × 1,25 M10 × 1 1,25 12,5 12,5 10,5 18,74 – – 7/16-20 UNF-2B3) 1,25 ±0,3 12,5 13,5 11,7 18,74 – – 7/16-20 UNF-2B3) 1,25 13,5 13,5 11,7 20,91 M12 M12 × 1,25 M12 × 1,5 1,25 14,8 14,8 12,6 20,91 (M14) (M14 × 1,5) – 1,5 ±0,4 16,8 16,8 14,7 24,27 M16 M16 × 1,5 – 1,5 18,8 18,8 16,8 26,51 Thread size h1 h2 m s Approx. mass, in kg, per d1 d1 × P 2) h14 h13 1000 units M3 – – 0,55 0,25 3 7,5 0,78 M4 – – 0,65 0,35 3,5 9 1,13 M5 – – 0,7 0,4 4 10 1,73 M6 – – 0,75 0,4 5 11 2,5 M8 M8 × 1 – 0,9 0,5 6,5 14 5,27 M10 M10 × 1,25 M10 × 1 1,15 0,65 8 17 9,58 – – 7/16-20 UNF-2B3) 1,15 0,65 10 17 12 – – 7/16-20 UNF-2B3) 1,4 0,8 10 19 14 M12 M12 × 1,25 M12 × 1,5 1,4 0,8 10 19 13,7 (M14) (M14 × 1,5) – 1,8 1 11 22 21,3 (M16) (M16 × 1,5) – 1,8 1 13 24 28,5 Bracketed sizes should not be used. 1) emin = 1,12 smin. 2) Thread pitch. 3) Thread series to ANSI B1.1; only to be used for fastening of seat belts in motor vehicles. Limit de- viations Limit de- viations 0 – 0,1 0 – 0,15 0 – 0,2 0 – 0,1 0 – 0,15 0 – 0,2 4 Technical delivery conditions 4.1 General requirements General requirements for standardized bolts, screws, studs and nuts are specified in ISO 8992. 4.2 Material Weld nuts shall be made of steel with a maximum carbon content of 0,25 %. If a specific steel grade is required, this shall be agreed on ordering. Page 4 DIN 929 : 2000-01 4.3 Design Weld nuts shall be of product grade A conforming to DIN EN ISO 4759-1 or DIN 267-2, with diameters and pitches in accordance with DIN 13-1 (coarse thread) or DIN 13-5 and DIN 13-6 (fine thread), tolerance class 6G to DIN 13-15 being permitted. 4.4 Mechanical properties If the proof load test specified in DIN EN 20898-2 or DIN EN ISO 898-6 is carried out, the loads given in table 2 shall be used. In case of dispute, welding projections shall be removed prior to testing. 4.5 Surface finish As a rule, hexagon weld nuts are to be supplied uncoated. Electroplated coatings shall comply with the specifications given in DIN EN ISO 4042. Since uncoated weld nuts may be affected by corrosion during transit or storage, the manufacturer shall provide corrosion protection that does not impair nut weldability. 4.6 Acceptance inspection Acceptance inspection shall comply with the specifications given in DIN EN ISO 3269. 5 Designation Designation of a size M10 hexagon weld nut made of steel (St): Nut DIN 929 – M10 – St If a hexagon weld nut with UNF thread is to be supplied, the width across flats shall be included in the designation. EXAMPLE: Designation of a size 7/16-20 UNF-2B hexagon weld nut, made of steel (St), with a width across flats of 17 mm (SW17): Nut DIN 929 – 7/16-20 UNF-2B – SW17 – St 6 Marking Hexagon weld nuts of sizes M5 and above shall be imprinted with the manufacturer’s symbol. Table 2: Proof loads Coarse thread Proof load, Fine thread Proof load,(size) in N (size) in N d1 d1 ×P M3 3 800 – – M4 6 800 – – M5 11 600 – – M6 15 500 – – M8 28 300 M8 × 1 30 200 M10 44 800 M10 × 1 50 200 – – M10 × 1,25 47 800 – – 7/16-20 UNF-2B 53 600 M12 65 300 M12 × 1,25 72 100 – – M12 × 1,5 68 200 M14 89 700 M14 × 1,5 97 500 M16 123 000 M16 × 1,5 132 000 Page 5 DIN 929 : 2000-01 7 Indication on drawings Figure 2: Indication on drawings 8 Connecting dimensions Figure 3: Connecting dimensions (nut not welded on) Table 3: Connecting dimensions Thread size as in table 1 Plate thickness, a Hole diameter, d5 d1 d1 × P Min. Max. (H11) M3 – – 0,63 1,5 4,5 M4 – – 0,75 1,5 6 M5 – – 0,88 2 7 M6 – – 0,88 2,5 8 M8 M8 × 1 – 1 3 10,5 M10 M10 × 1,25 M10 × 1 1,25 4 12,5 – – 7/16-20 UNF-2B 1,25 4 13,5 M12 M12 × 1,25 M12 × 1,5 1,5 5 14,8 M14 M14 × 1,5 – 2 6 16,8 M16 M16 × 1,5 – 2 6 18,8